[Diy_efi] (off topic) Disk pad wear reduction with

[Mike]

No, I think your wires are crossed a bit here...

Moving the caliper back by a short amount does not *have to* 
mean the pedal travel is increased at all. Of course it might
well do that in an unsophisticated arrangement.

Eg. When I service the brakes, the pedal is in its top (normal)
position. Yet when I remove the pads, I can push on the calipers
a little - they will retract - say 1mm, yet the pedal does not
move, the oil clearly goes 'somewhere' ;) Why cant this type
of paradigm be replicated under control when pedal is released
in normal operation,

I am thinking the equivalent should be possible to achieve by some
valving or solenoid arrangement - which obviously is not going to
be directly coupled to the pedal travel in terms of length of
travel, there may well be some
accumulator arrangement which is a bellows/alternate piston ect
which could well work off engine vacuum etc To achieve the desired
result.

I'm not sure what you mean be being reminded - I dont understand this
at all.

All I want is:-

a.	Normal pedal operation when braking
and
b.	Some hydraulic arrangement to retract the pads from the
	discs to *be sure* there is negligible chance of drag
	on those long country trips - with the added proviso that
	it wont push the pedal up by any proportionate amount (which
	is what I assumed is an ideal configuration/requirement).

In terms of 'if it aint broke dont fix it' I think you should be speaking
to religious dogmatic groups who are not interested in how technology
could be improved with a little thought and not to people interested
in alternate solutions and improving on what has gone before.
>From many perspectives steam engines work fine at 7% efficiency, they
aint broke but designers such as myself and many others on this user
group relegate the paradigm of 'if it aint broke dont fix it...' to
the dustbin of victorian deterministic thinking where it belongs and
seems only to be entertained by people with lazy minds who place
disproportionate faith in the abilities of industrial manufacturers
to provide the best technology under all circumstances !


rgds

mike



At 10:05 PM 5/12/2002 -0800, you wrote:
>--- Mike <erazmus at iinet.net.au> wrote:
>
>> I'm wondering if there is some valve arangement that
>> would only draw back enough to give say 0.5mm pad-
>> disc clearance
>
>You were just reminded that that woudl result in a
>ridiculously long pedal travel, along with an
>inconsistent travel and feel.  All of that is very bad
>in braking.
>
>If you have 4-wheel discs, that's a total of 4mm of
>clearance.  If you figure a 4:1 ratio between master
>cylinder and piston (for two-piston calipers, not that
>far off), that's 4mm of extra travel in the pushrod...
> At a 6:1 lever ratio for the pedal (straight manual
>brakes, no power assist), that's an extra INCH of
>pedal travel.  Definitely quite noticeable.
>
>
>> ...add something to *ensure* disc-pad drag is at a
>> minimum during that long trip,
>
>If it ain't broke...  What do you hope to gain?
>
>
>=====
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>|     had come up again."                    -Kurt Vonnegut     |
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